Yamaha - Cartridge Outer Plate Cooling System Component 6L2-44323-00-00. Overview. When you're rebuilding a water pump, it's not just about the impeller-the surrounding components matter just as much. This outer plate plays a key role in keeping everything aligned and sealed inside the pump housing. I've seen setups where skipping this part led to weak water flow even with a new impeller installed. Keeping it fresh ensures the pump does its job and the engine stays properly cooled.. Key Features. Supports Pump Alignment - Keeps internal water pump components properly positioned.. Maintains Seal Integrity - Helps prevent water leakage and loss of pressure.. Durable Construction - Built to handle constant water exposure and wear.. Factory-Spec Fitment - Designed to match Yamaha cooling system components for proper installation.. Essential for Pump Service - Commonly replaced during water pump rebuilds or maintenance.. Engine & Boat Compatibility. Designed for Yamaha outboard engines with